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![Linus Torvalds](/assets/img/avatar_default.png)
Pull audit updates from Eric Paris: "Nothing amazing. Formatting, small bug fixes, couple of fixes where we didn't get records due to some old VFS changes, and a change to how we collect execve info..." Fixed conflict in fs/exec.c as per Eric and linux-next. * git://git.infradead.org/users/eparis/audit: (28 commits) audit: fix type of sessionid in audit_set_loginuid() audit: call audit_bprm() only once to add AUDIT_EXECVE information audit: move audit_aux_data_execve contents into audit_context union audit: remove unused envc member of audit_aux_data_execve audit: Kill the unused struct audit_aux_data_capset audit: do not reject all AUDIT_INODE filter types audit: suppress stock memalloc failure warnings since already managed audit: log the audit_names record type audit: add child record before the create to handle case where create fails audit: use given values in tty_audit enable api audit: use nlmsg_len() to get message payload length audit: use memset instead of trying to initialize field by field audit: fix info leak in AUDIT_GET requests audit: update AUDIT_INODE filter rule to comparator function audit: audit feature to set loginuid immutable audit: audit feature to only allow unsetting the loginuid audit: allow unsetting the loginuid (with priv) audit: remove CONFIG_AUDIT_LOGINUID_IMMUTABLE audit: loginuid functions coding style selinux: apply selinux checks on new audit message types ...
1865 lines
48 KiB
C
1865 lines
48 KiB
C
/* audit.c -- Auditing support
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* Gateway between the kernel (e.g., selinux) and the user-space audit daemon.
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* System-call specific features have moved to auditsc.c
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*
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* Copyright 2003-2007 Red Hat Inc., Durham, North Carolina.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Written by Rickard E. (Rik) Faith <faith@redhat.com>
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*
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* Goals: 1) Integrate fully with Security Modules.
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* 2) Minimal run-time overhead:
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* a) Minimal when syscall auditing is disabled (audit_enable=0).
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* b) Small when syscall auditing is enabled and no audit record
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* is generated (defer as much work as possible to record
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* generation time):
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* i) context is allocated,
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* ii) names from getname are stored without a copy, and
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* iii) inode information stored from path_lookup.
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* 3) Ability to disable syscall auditing at boot time (audit=0).
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* 4) Usable by other parts of the kernel (if audit_log* is called,
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* then a syscall record will be generated automatically for the
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* current syscall).
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* 5) Netlink interface to user-space.
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* 6) Support low-overhead kernel-based filtering to minimize the
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* information that must be passed to user-space.
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*
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* Example user-space utilities: http://people.redhat.com/sgrubb/audit/
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*/
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#include <linux/init.h>
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#include <asm/types.h>
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#include <linux/atomic.h>
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#include <linux/mm.h>
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#include <linux/export.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/kthread.h>
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#include <linux/kernel.h>
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#include <linux/syscalls.h>
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#include <linux/audit.h>
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#include <net/sock.h>
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#include <net/netlink.h>
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#include <linux/skbuff.h>
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#ifdef CONFIG_SECURITY
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#include <linux/security.h>
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#endif
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#include <linux/freezer.h>
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#include <linux/tty.h>
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#include <linux/pid_namespace.h>
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#include "audit.h"
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/* No auditing will take place until audit_initialized == AUDIT_INITIALIZED.
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* (Initialization happens after skb_init is called.) */
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#define AUDIT_DISABLED -1
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#define AUDIT_UNINITIALIZED 0
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#define AUDIT_INITIALIZED 1
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static int audit_initialized;
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#define AUDIT_OFF 0
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#define AUDIT_ON 1
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#define AUDIT_LOCKED 2
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int audit_enabled;
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int audit_ever_enabled;
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EXPORT_SYMBOL_GPL(audit_enabled);
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/* Default state when kernel boots without any parameters. */
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static int audit_default;
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/* If auditing cannot proceed, audit_failure selects what happens. */
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static int audit_failure = AUDIT_FAIL_PRINTK;
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/*
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* If audit records are to be written to the netlink socket, audit_pid
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* contains the pid of the auditd process and audit_nlk_portid contains
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* the portid to use to send netlink messages to that process.
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*/
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int audit_pid;
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static int audit_nlk_portid;
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/* If audit_rate_limit is non-zero, limit the rate of sending audit records
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* to that number per second. This prevents DoS attacks, but results in
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* audit records being dropped. */
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static int audit_rate_limit;
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/* Number of outstanding audit_buffers allowed. */
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static int audit_backlog_limit = 64;
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static int audit_backlog_wait_time = 60 * HZ;
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static int audit_backlog_wait_overflow = 0;
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/* The identity of the user shutting down the audit system. */
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kuid_t audit_sig_uid = INVALID_UID;
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pid_t audit_sig_pid = -1;
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u32 audit_sig_sid = 0;
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/* Records can be lost in several ways:
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0) [suppressed in audit_alloc]
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1) out of memory in audit_log_start [kmalloc of struct audit_buffer]
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2) out of memory in audit_log_move [alloc_skb]
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3) suppressed due to audit_rate_limit
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4) suppressed due to audit_backlog_limit
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*/
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static atomic_t audit_lost = ATOMIC_INIT(0);
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/* The netlink socket. */
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static struct sock *audit_sock;
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/* Hash for inode-based rules */
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struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
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/* The audit_freelist is a list of pre-allocated audit buffers (if more
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* than AUDIT_MAXFREE are in use, the audit buffer is freed instead of
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* being placed on the freelist). */
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static DEFINE_SPINLOCK(audit_freelist_lock);
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static int audit_freelist_count;
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static LIST_HEAD(audit_freelist);
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static struct sk_buff_head audit_skb_queue;
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/* queue of skbs to send to auditd when/if it comes back */
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static struct sk_buff_head audit_skb_hold_queue;
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static struct task_struct *kauditd_task;
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static DECLARE_WAIT_QUEUE_HEAD(kauditd_wait);
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static DECLARE_WAIT_QUEUE_HEAD(audit_backlog_wait);
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static struct audit_features af = {.vers = AUDIT_FEATURE_VERSION,
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.mask = -1,
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.features = 0,
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.lock = 0,};
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static char *audit_feature_names[2] = {
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"only_unset_loginuid",
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"loginuid_immutable",
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};
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/* Serialize requests from userspace. */
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DEFINE_MUTEX(audit_cmd_mutex);
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/* AUDIT_BUFSIZ is the size of the temporary buffer used for formatting
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* audit records. Since printk uses a 1024 byte buffer, this buffer
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* should be at least that large. */
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#define AUDIT_BUFSIZ 1024
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/* AUDIT_MAXFREE is the number of empty audit_buffers we keep on the
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* audit_freelist. Doing so eliminates many kmalloc/kfree calls. */
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#define AUDIT_MAXFREE (2*NR_CPUS)
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/* The audit_buffer is used when formatting an audit record. The caller
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* locks briefly to get the record off the freelist or to allocate the
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* buffer, and locks briefly to send the buffer to the netlink layer or
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* to place it on a transmit queue. Multiple audit_buffers can be in
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* use simultaneously. */
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struct audit_buffer {
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struct list_head list;
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struct sk_buff *skb; /* formatted skb ready to send */
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struct audit_context *ctx; /* NULL or associated context */
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gfp_t gfp_mask;
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};
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struct audit_reply {
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int pid;
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struct sk_buff *skb;
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};
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static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
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{
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if (ab) {
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struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
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nlh->nlmsg_pid = pid;
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}
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}
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void audit_panic(const char *message)
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{
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switch (audit_failure)
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{
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case AUDIT_FAIL_SILENT:
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break;
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case AUDIT_FAIL_PRINTK:
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if (printk_ratelimit())
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printk(KERN_ERR "audit: %s\n", message);
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break;
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case AUDIT_FAIL_PANIC:
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/* test audit_pid since printk is always losey, why bother? */
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if (audit_pid)
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panic("audit: %s\n", message);
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break;
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}
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}
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static inline int audit_rate_check(void)
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{
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static unsigned long last_check = 0;
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static int messages = 0;
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static DEFINE_SPINLOCK(lock);
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unsigned long flags;
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unsigned long now;
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unsigned long elapsed;
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int retval = 0;
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if (!audit_rate_limit) return 1;
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spin_lock_irqsave(&lock, flags);
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if (++messages < audit_rate_limit) {
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retval = 1;
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} else {
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now = jiffies;
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elapsed = now - last_check;
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if (elapsed > HZ) {
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last_check = now;
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messages = 0;
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retval = 1;
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}
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}
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spin_unlock_irqrestore(&lock, flags);
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return retval;
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}
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/**
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* audit_log_lost - conditionally log lost audit message event
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* @message: the message stating reason for lost audit message
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*
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* Emit at least 1 message per second, even if audit_rate_check is
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* throttling.
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* Always increment the lost messages counter.
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*/
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void audit_log_lost(const char *message)
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{
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static unsigned long last_msg = 0;
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static DEFINE_SPINLOCK(lock);
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unsigned long flags;
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unsigned long now;
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int print;
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atomic_inc(&audit_lost);
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print = (audit_failure == AUDIT_FAIL_PANIC || !audit_rate_limit);
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if (!print) {
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spin_lock_irqsave(&lock, flags);
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now = jiffies;
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if (now - last_msg > HZ) {
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print = 1;
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last_msg = now;
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}
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spin_unlock_irqrestore(&lock, flags);
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}
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if (print) {
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if (printk_ratelimit())
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printk(KERN_WARNING
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"audit: audit_lost=%d audit_rate_limit=%d "
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"audit_backlog_limit=%d\n",
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atomic_read(&audit_lost),
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audit_rate_limit,
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audit_backlog_limit);
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audit_panic(message);
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}
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}
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static int audit_log_config_change(char *function_name, int new, int old,
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int allow_changes)
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{
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struct audit_buffer *ab;
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int rc = 0;
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ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE);
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if (unlikely(!ab))
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return rc;
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audit_log_format(ab, "%s=%d old=%d", function_name, new, old);
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audit_log_session_info(ab);
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rc = audit_log_task_context(ab);
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if (rc)
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allow_changes = 0; /* Something weird, deny request */
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audit_log_format(ab, " res=%d", allow_changes);
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audit_log_end(ab);
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return rc;
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}
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static int audit_do_config_change(char *function_name, int *to_change, int new)
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{
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int allow_changes, rc = 0, old = *to_change;
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/* check if we are locked */
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if (audit_enabled == AUDIT_LOCKED)
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allow_changes = 0;
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else
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allow_changes = 1;
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if (audit_enabled != AUDIT_OFF) {
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rc = audit_log_config_change(function_name, new, old, allow_changes);
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if (rc)
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allow_changes = 0;
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}
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/* If we are allowed, make the change */
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if (allow_changes == 1)
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*to_change = new;
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/* Not allowed, update reason */
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else if (rc == 0)
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rc = -EPERM;
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return rc;
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}
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static int audit_set_rate_limit(int limit)
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{
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return audit_do_config_change("audit_rate_limit", &audit_rate_limit, limit);
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}
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static int audit_set_backlog_limit(int limit)
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{
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return audit_do_config_change("audit_backlog_limit", &audit_backlog_limit, limit);
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}
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static int audit_set_enabled(int state)
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{
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int rc;
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if (state < AUDIT_OFF || state > AUDIT_LOCKED)
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return -EINVAL;
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rc = audit_do_config_change("audit_enabled", &audit_enabled, state);
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if (!rc)
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audit_ever_enabled |= !!state;
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return rc;
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}
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static int audit_set_failure(int state)
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{
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if (state != AUDIT_FAIL_SILENT
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&& state != AUDIT_FAIL_PRINTK
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&& state != AUDIT_FAIL_PANIC)
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return -EINVAL;
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return audit_do_config_change("audit_failure", &audit_failure, state);
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}
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/*
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* Queue skbs to be sent to auditd when/if it comes back. These skbs should
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* already have been sent via prink/syslog and so if these messages are dropped
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* it is not a huge concern since we already passed the audit_log_lost()
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* notification and stuff. This is just nice to get audit messages during
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* boot before auditd is running or messages generated while auditd is stopped.
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* This only holds messages is audit_default is set, aka booting with audit=1
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* or building your kernel that way.
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*/
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static void audit_hold_skb(struct sk_buff *skb)
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{
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if (audit_default &&
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skb_queue_len(&audit_skb_hold_queue) < audit_backlog_limit)
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skb_queue_tail(&audit_skb_hold_queue, skb);
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else
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kfree_skb(skb);
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}
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/*
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* For one reason or another this nlh isn't getting delivered to the userspace
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* audit daemon, just send it to printk.
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*/
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static void audit_printk_skb(struct sk_buff *skb)
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{
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struct nlmsghdr *nlh = nlmsg_hdr(skb);
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char *data = nlmsg_data(nlh);
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if (nlh->nlmsg_type != AUDIT_EOE) {
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if (printk_ratelimit())
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printk(KERN_NOTICE "type=%d %s\n", nlh->nlmsg_type, data);
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else
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audit_log_lost("printk limit exceeded\n");
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}
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audit_hold_skb(skb);
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}
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static void kauditd_send_skb(struct sk_buff *skb)
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{
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int err;
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/* take a reference in case we can't send it and we want to hold it */
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skb_get(skb);
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err = netlink_unicast(audit_sock, skb, audit_nlk_portid, 0);
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if (err < 0) {
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BUG_ON(err != -ECONNREFUSED); /* Shouldn't happen */
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printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
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audit_log_lost("auditd disappeared\n");
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audit_pid = 0;
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/* we might get lucky and get this in the next auditd */
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audit_hold_skb(skb);
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} else
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/* drop the extra reference if sent ok */
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consume_skb(skb);
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}
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/*
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* flush_hold_queue - empty the hold queue if auditd appears
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*
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* If auditd just started, drain the queue of messages already
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* sent to syslog/printk. Remember loss here is ok. We already
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* called audit_log_lost() if it didn't go out normally. so the
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* race between the skb_dequeue and the next check for audit_pid
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* doesn't matter.
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*
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* If you ever find kauditd to be too slow we can get a perf win
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* by doing our own locking and keeping better track if there
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* are messages in this queue. I don't see the need now, but
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* in 5 years when I want to play with this again I'll see this
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* note and still have no friggin idea what i'm thinking today.
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*/
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static void flush_hold_queue(void)
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{
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struct sk_buff *skb;
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if (!audit_default || !audit_pid)
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return;
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skb = skb_dequeue(&audit_skb_hold_queue);
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if (likely(!skb))
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return;
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while (skb && audit_pid) {
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kauditd_send_skb(skb);
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skb = skb_dequeue(&audit_skb_hold_queue);
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}
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/*
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* if auditd just disappeared but we
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* dequeued an skb we need to drop ref
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*/
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if (skb)
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consume_skb(skb);
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}
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|
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static int kauditd_thread(void *dummy)
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{
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set_freezable();
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while (!kthread_should_stop()) {
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struct sk_buff *skb;
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DECLARE_WAITQUEUE(wait, current);
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flush_hold_queue();
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skb = skb_dequeue(&audit_skb_queue);
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wake_up(&audit_backlog_wait);
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if (skb) {
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if (audit_pid)
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kauditd_send_skb(skb);
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else
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audit_printk_skb(skb);
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continue;
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}
|
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set_current_state(TASK_INTERRUPTIBLE);
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add_wait_queue(&kauditd_wait, &wait);
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|
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if (!skb_queue_len(&audit_skb_queue)) {
|
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try_to_freeze();
|
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schedule();
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}
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|
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__set_current_state(TASK_RUNNING);
|
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remove_wait_queue(&kauditd_wait, &wait);
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}
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return 0;
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}
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|
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int audit_send_list(void *_dest)
|
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{
|
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struct audit_netlink_list *dest = _dest;
|
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int pid = dest->pid;
|
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struct sk_buff *skb;
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/* wait for parent to finish and send an ACK */
|
|
mutex_lock(&audit_cmd_mutex);
|
|
mutex_unlock(&audit_cmd_mutex);
|
|
|
|
while ((skb = __skb_dequeue(&dest->q)) != NULL)
|
|
netlink_unicast(audit_sock, skb, pid, 0);
|
|
|
|
kfree(dest);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct sk_buff *audit_make_reply(int pid, int seq, int type, int done,
|
|
int multi, const void *payload, int size)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct nlmsghdr *nlh;
|
|
void *data;
|
|
int flags = multi ? NLM_F_MULTI : 0;
|
|
int t = done ? NLMSG_DONE : type;
|
|
|
|
skb = nlmsg_new(size, GFP_KERNEL);
|
|
if (!skb)
|
|
return NULL;
|
|
|
|
nlh = nlmsg_put(skb, pid, seq, t, size, flags);
|
|
if (!nlh)
|
|
goto out_kfree_skb;
|
|
data = nlmsg_data(nlh);
|
|
memcpy(data, payload, size);
|
|
return skb;
|
|
|
|
out_kfree_skb:
|
|
kfree_skb(skb);
|
|
return NULL;
|
|
}
|
|
|
|
static int audit_send_reply_thread(void *arg)
|
|
{
|
|
struct audit_reply *reply = (struct audit_reply *)arg;
|
|
|
|
mutex_lock(&audit_cmd_mutex);
|
|
mutex_unlock(&audit_cmd_mutex);
|
|
|
|
/* Ignore failure. It'll only happen if the sender goes away,
|
|
because our timeout is set to infinite. */
|
|
netlink_unicast(audit_sock, reply->skb, reply->pid, 0);
|
|
kfree(reply);
|
|
return 0;
|
|
}
|
|
/**
|
|
* audit_send_reply - send an audit reply message via netlink
|
|
* @pid: process id to send reply to
|
|
* @seq: sequence number
|
|
* @type: audit message type
|
|
* @done: done (last) flag
|
|
* @multi: multi-part message flag
|
|
* @payload: payload data
|
|
* @size: payload size
|
|
*
|
|
* Allocates an skb, builds the netlink message, and sends it to the pid.
|
|
* No failure notifications.
|
|
*/
|
|
static void audit_send_reply(int pid, int seq, int type, int done, int multi,
|
|
const void *payload, int size)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct task_struct *tsk;
|
|
struct audit_reply *reply = kmalloc(sizeof(struct audit_reply),
|
|
GFP_KERNEL);
|
|
|
|
if (!reply)
|
|
return;
|
|
|
|
skb = audit_make_reply(pid, seq, type, done, multi, payload, size);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
reply->pid = pid;
|
|
reply->skb = skb;
|
|
|
|
tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
|
|
if (!IS_ERR(tsk))
|
|
return;
|
|
kfree_skb(skb);
|
|
out:
|
|
kfree(reply);
|
|
}
|
|
|
|
/*
|
|
* Check for appropriate CAP_AUDIT_ capabilities on incoming audit
|
|
* control messages.
|
|
*/
|
|
static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
|
|
{
|
|
int err = 0;
|
|
|
|
/* Only support the initial namespaces for now. */
|
|
if ((current_user_ns() != &init_user_ns) ||
|
|
(task_active_pid_ns(current) != &init_pid_ns))
|
|
return -EPERM;
|
|
|
|
switch (msg_type) {
|
|
case AUDIT_LIST:
|
|
case AUDIT_ADD:
|
|
case AUDIT_DEL:
|
|
return -EOPNOTSUPP;
|
|
case AUDIT_GET:
|
|
case AUDIT_SET:
|
|
case AUDIT_GET_FEATURE:
|
|
case AUDIT_SET_FEATURE:
|
|
case AUDIT_LIST_RULES:
|
|
case AUDIT_ADD_RULE:
|
|
case AUDIT_DEL_RULE:
|
|
case AUDIT_SIGNAL_INFO:
|
|
case AUDIT_TTY_GET:
|
|
case AUDIT_TTY_SET:
|
|
case AUDIT_TRIM:
|
|
case AUDIT_MAKE_EQUIV:
|
|
if (!capable(CAP_AUDIT_CONTROL))
|
|
err = -EPERM;
|
|
break;
|
|
case AUDIT_USER:
|
|
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
|
|
case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
|
|
if (!capable(CAP_AUDIT_WRITE))
|
|
err = -EPERM;
|
|
break;
|
|
default: /* bad msg */
|
|
err = -EINVAL;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type)
|
|
{
|
|
int rc = 0;
|
|
uid_t uid = from_kuid(&init_user_ns, current_uid());
|
|
|
|
if (!audit_enabled && msg_type != AUDIT_USER_AVC) {
|
|
*ab = NULL;
|
|
return rc;
|
|
}
|
|
|
|
*ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
|
|
if (unlikely(!*ab))
|
|
return rc;
|
|
audit_log_format(*ab, "pid=%d uid=%u", task_tgid_vnr(current), uid);
|
|
audit_log_session_info(*ab);
|
|
audit_log_task_context(*ab);
|
|
|
|
return rc;
|
|
}
|
|
|
|
int is_audit_feature_set(int i)
|
|
{
|
|
return af.features & AUDIT_FEATURE_TO_MASK(i);
|
|
}
|
|
|
|
|
|
static int audit_get_feature(struct sk_buff *skb)
|
|
{
|
|
u32 seq;
|
|
|
|
seq = nlmsg_hdr(skb)->nlmsg_seq;
|
|
|
|
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
|
|
&af, sizeof(af));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature,
|
|
u32 old_lock, u32 new_lock, int res)
|
|
{
|
|
struct audit_buffer *ab;
|
|
|
|
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_FEATURE_CHANGE);
|
|
audit_log_format(ab, "feature=%s new=%d old=%d old_lock=%d new_lock=%d res=%d",
|
|
audit_feature_names[which], !!old_feature, !!new_feature,
|
|
!!old_lock, !!new_lock, res);
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
static int audit_set_feature(struct sk_buff *skb)
|
|
{
|
|
struct audit_features *uaf;
|
|
int i;
|
|
|
|
BUILD_BUG_ON(AUDIT_LAST_FEATURE + 1 > sizeof(audit_feature_names)/sizeof(audit_feature_names[0]));
|
|
uaf = nlmsg_data(nlmsg_hdr(skb));
|
|
|
|
/* if there is ever a version 2 we should handle that here */
|
|
|
|
for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
|
|
u32 feature = AUDIT_FEATURE_TO_MASK(i);
|
|
u32 old_feature, new_feature, old_lock, new_lock;
|
|
|
|
/* if we are not changing this feature, move along */
|
|
if (!(feature & uaf->mask))
|
|
continue;
|
|
|
|
old_feature = af.features & feature;
|
|
new_feature = uaf->features & feature;
|
|
new_lock = (uaf->lock | af.lock) & feature;
|
|
old_lock = af.lock & feature;
|
|
|
|
/* are we changing a locked feature? */
|
|
if ((af.lock & feature) && (new_feature != old_feature)) {
|
|
audit_log_feature_change(i, old_feature, new_feature,
|
|
old_lock, new_lock, 0);
|
|
return -EPERM;
|
|
}
|
|
}
|
|
/* nothing invalid, do the changes */
|
|
for (i = 0; i <= AUDIT_LAST_FEATURE; i++) {
|
|
u32 feature = AUDIT_FEATURE_TO_MASK(i);
|
|
u32 old_feature, new_feature, old_lock, new_lock;
|
|
|
|
/* if we are not changing this feature, move along */
|
|
if (!(feature & uaf->mask))
|
|
continue;
|
|
|
|
old_feature = af.features & feature;
|
|
new_feature = uaf->features & feature;
|
|
old_lock = af.lock & feature;
|
|
new_lock = (uaf->lock | af.lock) & feature;
|
|
|
|
if (new_feature != old_feature)
|
|
audit_log_feature_change(i, old_feature, new_feature,
|
|
old_lock, new_lock, 1);
|
|
|
|
if (new_feature)
|
|
af.features |= feature;
|
|
else
|
|
af.features &= ~feature;
|
|
af.lock |= new_lock;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
u32 seq;
|
|
void *data;
|
|
struct audit_status *status_get, status_set;
|
|
int err;
|
|
struct audit_buffer *ab;
|
|
u16 msg_type = nlh->nlmsg_type;
|
|
struct audit_sig_info *sig_data;
|
|
char *ctx = NULL;
|
|
u32 len;
|
|
|
|
err = audit_netlink_ok(skb, msg_type);
|
|
if (err)
|
|
return err;
|
|
|
|
/* As soon as there's any sign of userspace auditd,
|
|
* start kauditd to talk to it */
|
|
if (!kauditd_task) {
|
|
kauditd_task = kthread_run(kauditd_thread, NULL, "kauditd");
|
|
if (IS_ERR(kauditd_task)) {
|
|
err = PTR_ERR(kauditd_task);
|
|
kauditd_task = NULL;
|
|
return err;
|
|
}
|
|
}
|
|
seq = nlh->nlmsg_seq;
|
|
data = nlmsg_data(nlh);
|
|
|
|
switch (msg_type) {
|
|
case AUDIT_GET:
|
|
memset(&status_set, 0, sizeof(status_set));
|
|
status_set.enabled = audit_enabled;
|
|
status_set.failure = audit_failure;
|
|
status_set.pid = audit_pid;
|
|
status_set.rate_limit = audit_rate_limit;
|
|
status_set.backlog_limit = audit_backlog_limit;
|
|
status_set.lost = atomic_read(&audit_lost);
|
|
status_set.backlog = skb_queue_len(&audit_skb_queue);
|
|
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_GET, 0, 0,
|
|
&status_set, sizeof(status_set));
|
|
break;
|
|
case AUDIT_SET:
|
|
if (nlmsg_len(nlh) < sizeof(struct audit_status))
|
|
return -EINVAL;
|
|
status_get = (struct audit_status *)data;
|
|
if (status_get->mask & AUDIT_STATUS_ENABLED) {
|
|
err = audit_set_enabled(status_get->enabled);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
if (status_get->mask & AUDIT_STATUS_FAILURE) {
|
|
err = audit_set_failure(status_get->failure);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
if (status_get->mask & AUDIT_STATUS_PID) {
|
|
int new_pid = status_get->pid;
|
|
|
|
if (audit_enabled != AUDIT_OFF)
|
|
audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
|
|
audit_pid = new_pid;
|
|
audit_nlk_portid = NETLINK_CB(skb).portid;
|
|
}
|
|
if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
|
|
err = audit_set_rate_limit(status_get->rate_limit);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
if (status_get->mask & AUDIT_STATUS_BACKLOG_LIMIT)
|
|
err = audit_set_backlog_limit(status_get->backlog_limit);
|
|
break;
|
|
case AUDIT_GET_FEATURE:
|
|
err = audit_get_feature(skb);
|
|
if (err)
|
|
return err;
|
|
break;
|
|
case AUDIT_SET_FEATURE:
|
|
err = audit_set_feature(skb);
|
|
if (err)
|
|
return err;
|
|
break;
|
|
case AUDIT_USER:
|
|
case AUDIT_FIRST_USER_MSG ... AUDIT_LAST_USER_MSG:
|
|
case AUDIT_FIRST_USER_MSG2 ... AUDIT_LAST_USER_MSG2:
|
|
if (!audit_enabled && msg_type != AUDIT_USER_AVC)
|
|
return 0;
|
|
|
|
err = audit_filter_user(msg_type);
|
|
if (err == 1) {
|
|
err = 0;
|
|
if (msg_type == AUDIT_USER_TTY) {
|
|
err = tty_audit_push_current();
|
|
if (err)
|
|
break;
|
|
}
|
|
audit_log_common_recv_msg(&ab, msg_type);
|
|
if (msg_type != AUDIT_USER_TTY)
|
|
audit_log_format(ab, " msg='%.*s'",
|
|
AUDIT_MESSAGE_TEXT_MAX,
|
|
(char *)data);
|
|
else {
|
|
int size;
|
|
|
|
audit_log_format(ab, " data=");
|
|
size = nlmsg_len(nlh);
|
|
if (size > 0 &&
|
|
((unsigned char *)data)[size - 1] == '\0')
|
|
size--;
|
|
audit_log_n_untrustedstring(ab, data, size);
|
|
}
|
|
audit_set_pid(ab, NETLINK_CB(skb).portid);
|
|
audit_log_end(ab);
|
|
}
|
|
break;
|
|
case AUDIT_ADD_RULE:
|
|
case AUDIT_DEL_RULE:
|
|
if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
|
|
return -EINVAL;
|
|
if (audit_enabled == AUDIT_LOCKED) {
|
|
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
|
|
audit_log_format(ab, " audit_enabled=%d res=0", audit_enabled);
|
|
audit_log_end(ab);
|
|
return -EPERM;
|
|
}
|
|
/* fallthrough */
|
|
case AUDIT_LIST_RULES:
|
|
err = audit_receive_filter(msg_type, NETLINK_CB(skb).portid,
|
|
seq, data, nlmsg_len(nlh));
|
|
break;
|
|
case AUDIT_TRIM:
|
|
audit_trim_trees();
|
|
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
|
|
audit_log_format(ab, " op=trim res=1");
|
|
audit_log_end(ab);
|
|
break;
|
|
case AUDIT_MAKE_EQUIV: {
|
|
void *bufp = data;
|
|
u32 sizes[2];
|
|
size_t msglen = nlmsg_len(nlh);
|
|
char *old, *new;
|
|
|
|
err = -EINVAL;
|
|
if (msglen < 2 * sizeof(u32))
|
|
break;
|
|
memcpy(sizes, bufp, 2 * sizeof(u32));
|
|
bufp += 2 * sizeof(u32);
|
|
msglen -= 2 * sizeof(u32);
|
|
old = audit_unpack_string(&bufp, &msglen, sizes[0]);
|
|
if (IS_ERR(old)) {
|
|
err = PTR_ERR(old);
|
|
break;
|
|
}
|
|
new = audit_unpack_string(&bufp, &msglen, sizes[1]);
|
|
if (IS_ERR(new)) {
|
|
err = PTR_ERR(new);
|
|
kfree(old);
|
|
break;
|
|
}
|
|
/* OK, here comes... */
|
|
err = audit_tag_tree(old, new);
|
|
|
|
audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE);
|
|
|
|
audit_log_format(ab, " op=make_equiv old=");
|
|
audit_log_untrustedstring(ab, old);
|
|
audit_log_format(ab, " new=");
|
|
audit_log_untrustedstring(ab, new);
|
|
audit_log_format(ab, " res=%d", !err);
|
|
audit_log_end(ab);
|
|
kfree(old);
|
|
kfree(new);
|
|
break;
|
|
}
|
|
case AUDIT_SIGNAL_INFO:
|
|
len = 0;
|
|
if (audit_sig_sid) {
|
|
err = security_secid_to_secctx(audit_sig_sid, &ctx, &len);
|
|
if (err)
|
|
return err;
|
|
}
|
|
sig_data = kmalloc(sizeof(*sig_data) + len, GFP_KERNEL);
|
|
if (!sig_data) {
|
|
if (audit_sig_sid)
|
|
security_release_secctx(ctx, len);
|
|
return -ENOMEM;
|
|
}
|
|
sig_data->uid = from_kuid(&init_user_ns, audit_sig_uid);
|
|
sig_data->pid = audit_sig_pid;
|
|
if (audit_sig_sid) {
|
|
memcpy(sig_data->ctx, ctx, len);
|
|
security_release_secctx(ctx, len);
|
|
}
|
|
audit_send_reply(NETLINK_CB(skb).portid, seq, AUDIT_SIGNAL_INFO,
|
|
0, 0, sig_data, sizeof(*sig_data) + len);
|
|
kfree(sig_data);
|
|
break;
|
|
case AUDIT_TTY_GET: {
|
|
struct audit_tty_status s;
|
|
struct task_struct *tsk = current;
|
|
|
|
spin_lock(&tsk->sighand->siglock);
|
|
s.enabled = tsk->signal->audit_tty;
|
|
s.log_passwd = tsk->signal->audit_tty_log_passwd;
|
|
spin_unlock(&tsk->sighand->siglock);
|
|
|
|
audit_send_reply(NETLINK_CB(skb).portid, seq,
|
|
AUDIT_TTY_GET, 0, 0, &s, sizeof(s));
|
|
break;
|
|
}
|
|
case AUDIT_TTY_SET: {
|
|
struct audit_tty_status s;
|
|
struct task_struct *tsk = current;
|
|
|
|
memset(&s, 0, sizeof(s));
|
|
/* guard against past and future API changes */
|
|
memcpy(&s, data, min_t(size_t, sizeof(s), nlmsg_len(nlh)));
|
|
if ((s.enabled != 0 && s.enabled != 1) ||
|
|
(s.log_passwd != 0 && s.log_passwd != 1))
|
|
return -EINVAL;
|
|
|
|
spin_lock(&tsk->sighand->siglock);
|
|
tsk->signal->audit_tty = s.enabled;
|
|
tsk->signal->audit_tty_log_passwd = s.log_passwd;
|
|
spin_unlock(&tsk->sighand->siglock);
|
|
break;
|
|
}
|
|
default:
|
|
err = -EINVAL;
|
|
break;
|
|
}
|
|
|
|
return err < 0 ? err : 0;
|
|
}
|
|
|
|
/*
|
|
* Get message from skb. Each message is processed by audit_receive_msg.
|
|
* Malformed skbs with wrong length are discarded silently.
|
|
*/
|
|
static void audit_receive_skb(struct sk_buff *skb)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
/*
|
|
* len MUST be signed for nlmsg_next to be able to dec it below 0
|
|
* if the nlmsg_len was not aligned
|
|
*/
|
|
int len;
|
|
int err;
|
|
|
|
nlh = nlmsg_hdr(skb);
|
|
len = skb->len;
|
|
|
|
while (nlmsg_ok(nlh, len)) {
|
|
err = audit_receive_msg(skb, nlh);
|
|
/* if err or if this message says it wants a response */
|
|
if (err || (nlh->nlmsg_flags & NLM_F_ACK))
|
|
netlink_ack(skb, nlh, err);
|
|
|
|
nlh = nlmsg_next(nlh, &len);
|
|
}
|
|
}
|
|
|
|
/* Receive messages from netlink socket. */
|
|
static void audit_receive(struct sk_buff *skb)
|
|
{
|
|
mutex_lock(&audit_cmd_mutex);
|
|
audit_receive_skb(skb);
|
|
mutex_unlock(&audit_cmd_mutex);
|
|
}
|
|
|
|
/* Initialize audit support at boot time. */
|
|
static int __init audit_init(void)
|
|
{
|
|
int i;
|
|
struct netlink_kernel_cfg cfg = {
|
|
.input = audit_receive,
|
|
};
|
|
|
|
if (audit_initialized == AUDIT_DISABLED)
|
|
return 0;
|
|
|
|
printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
|
|
audit_default ? "enabled" : "disabled");
|
|
audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, &cfg);
|
|
if (!audit_sock)
|
|
audit_panic("cannot initialize netlink socket");
|
|
else
|
|
audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
|
|
|
|
skb_queue_head_init(&audit_skb_queue);
|
|
skb_queue_head_init(&audit_skb_hold_queue);
|
|
audit_initialized = AUDIT_INITIALIZED;
|
|
audit_enabled = audit_default;
|
|
audit_ever_enabled |= !!audit_default;
|
|
|
|
audit_log(NULL, GFP_KERNEL, AUDIT_KERNEL, "initialized");
|
|
|
|
for (i = 0; i < AUDIT_INODE_BUCKETS; i++)
|
|
INIT_LIST_HEAD(&audit_inode_hash[i]);
|
|
|
|
return 0;
|
|
}
|
|
__initcall(audit_init);
|
|
|
|
/* Process kernel command-line parameter at boot time. audit=0 or audit=1. */
|
|
static int __init audit_enable(char *str)
|
|
{
|
|
audit_default = !!simple_strtol(str, NULL, 0);
|
|
if (!audit_default)
|
|
audit_initialized = AUDIT_DISABLED;
|
|
|
|
printk(KERN_INFO "audit: %s", audit_default ? "enabled" : "disabled");
|
|
|
|
if (audit_initialized == AUDIT_INITIALIZED) {
|
|
audit_enabled = audit_default;
|
|
audit_ever_enabled |= !!audit_default;
|
|
} else if (audit_initialized == AUDIT_UNINITIALIZED) {
|
|
printk(" (after initialization)");
|
|
} else {
|
|
printk(" (until reboot)");
|
|
}
|
|
printk("\n");
|
|
|
|
return 1;
|
|
}
|
|
|
|
__setup("audit=", audit_enable);
|
|
|
|
static void audit_buffer_free(struct audit_buffer *ab)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!ab)
|
|
return;
|
|
|
|
if (ab->skb)
|
|
kfree_skb(ab->skb);
|
|
|
|
spin_lock_irqsave(&audit_freelist_lock, flags);
|
|
if (audit_freelist_count > AUDIT_MAXFREE)
|
|
kfree(ab);
|
|
else {
|
|
audit_freelist_count++;
|
|
list_add(&ab->list, &audit_freelist);
|
|
}
|
|
spin_unlock_irqrestore(&audit_freelist_lock, flags);
|
|
}
|
|
|
|
static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx,
|
|
gfp_t gfp_mask, int type)
|
|
{
|
|
unsigned long flags;
|
|
struct audit_buffer *ab = NULL;
|
|
struct nlmsghdr *nlh;
|
|
|
|
spin_lock_irqsave(&audit_freelist_lock, flags);
|
|
if (!list_empty(&audit_freelist)) {
|
|
ab = list_entry(audit_freelist.next,
|
|
struct audit_buffer, list);
|
|
list_del(&ab->list);
|
|
--audit_freelist_count;
|
|
}
|
|
spin_unlock_irqrestore(&audit_freelist_lock, flags);
|
|
|
|
if (!ab) {
|
|
ab = kmalloc(sizeof(*ab), gfp_mask);
|
|
if (!ab)
|
|
goto err;
|
|
}
|
|
|
|
ab->ctx = ctx;
|
|
ab->gfp_mask = gfp_mask;
|
|
|
|
ab->skb = nlmsg_new(AUDIT_BUFSIZ, gfp_mask);
|
|
if (!ab->skb)
|
|
goto err;
|
|
|
|
nlh = nlmsg_put(ab->skb, 0, 0, type, 0, 0);
|
|
if (!nlh)
|
|
goto out_kfree_skb;
|
|
|
|
return ab;
|
|
|
|
out_kfree_skb:
|
|
kfree_skb(ab->skb);
|
|
ab->skb = NULL;
|
|
err:
|
|
audit_buffer_free(ab);
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* audit_serial - compute a serial number for the audit record
|
|
*
|
|
* Compute a serial number for the audit record. Audit records are
|
|
* written to user-space as soon as they are generated, so a complete
|
|
* audit record may be written in several pieces. The timestamp of the
|
|
* record and this serial number are used by the user-space tools to
|
|
* determine which pieces belong to the same audit record. The
|
|
* (timestamp,serial) tuple is unique for each syscall and is live from
|
|
* syscall entry to syscall exit.
|
|
*
|
|
* NOTE: Another possibility is to store the formatted records off the
|
|
* audit context (for those records that have a context), and emit them
|
|
* all at syscall exit. However, this could delay the reporting of
|
|
* significant errors until syscall exit (or never, if the system
|
|
* halts).
|
|
*/
|
|
unsigned int audit_serial(void)
|
|
{
|
|
static DEFINE_SPINLOCK(serial_lock);
|
|
static unsigned int serial = 0;
|
|
|
|
unsigned long flags;
|
|
unsigned int ret;
|
|
|
|
spin_lock_irqsave(&serial_lock, flags);
|
|
do {
|
|
ret = ++serial;
|
|
} while (unlikely(!ret));
|
|
spin_unlock_irqrestore(&serial_lock, flags);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void audit_get_stamp(struct audit_context *ctx,
|
|
struct timespec *t, unsigned int *serial)
|
|
{
|
|
if (!ctx || !auditsc_get_stamp(ctx, t, serial)) {
|
|
*t = CURRENT_TIME;
|
|
*serial = audit_serial();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Wait for auditd to drain the queue a little
|
|
*/
|
|
static void wait_for_auditd(unsigned long sleep_time)
|
|
{
|
|
DECLARE_WAITQUEUE(wait, current);
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
add_wait_queue(&audit_backlog_wait, &wait);
|
|
|
|
if (audit_backlog_limit &&
|
|
skb_queue_len(&audit_skb_queue) > audit_backlog_limit)
|
|
schedule_timeout(sleep_time);
|
|
|
|
__set_current_state(TASK_RUNNING);
|
|
remove_wait_queue(&audit_backlog_wait, &wait);
|
|
}
|
|
|
|
/**
|
|
* audit_log_start - obtain an audit buffer
|
|
* @ctx: audit_context (may be NULL)
|
|
* @gfp_mask: type of allocation
|
|
* @type: audit message type
|
|
*
|
|
* Returns audit_buffer pointer on success or NULL on error.
|
|
*
|
|
* Obtain an audit buffer. This routine does locking to obtain the
|
|
* audit buffer, but then no locking is required for calls to
|
|
* audit_log_*format. If the task (ctx) is a task that is currently in a
|
|
* syscall, then the syscall is marked as auditable and an audit record
|
|
* will be written at syscall exit. If there is no associated task, then
|
|
* task context (ctx) should be NULL.
|
|
*/
|
|
struct audit_buffer *audit_log_start(struct audit_context *ctx, gfp_t gfp_mask,
|
|
int type)
|
|
{
|
|
struct audit_buffer *ab = NULL;
|
|
struct timespec t;
|
|
unsigned int uninitialized_var(serial);
|
|
int reserve;
|
|
unsigned long timeout_start = jiffies;
|
|
|
|
if (audit_initialized != AUDIT_INITIALIZED)
|
|
return NULL;
|
|
|
|
if (unlikely(audit_filter_type(type)))
|
|
return NULL;
|
|
|
|
if (gfp_mask & __GFP_WAIT)
|
|
reserve = 0;
|
|
else
|
|
reserve = 5; /* Allow atomic callers to go up to five
|
|
entries over the normal backlog limit */
|
|
|
|
while (audit_backlog_limit
|
|
&& skb_queue_len(&audit_skb_queue) > audit_backlog_limit + reserve) {
|
|
if (gfp_mask & __GFP_WAIT && audit_backlog_wait_time) {
|
|
unsigned long sleep_time;
|
|
|
|
sleep_time = timeout_start + audit_backlog_wait_time -
|
|
jiffies;
|
|
if ((long)sleep_time > 0) {
|
|
wait_for_auditd(sleep_time);
|
|
continue;
|
|
}
|
|
}
|
|
if (audit_rate_check() && printk_ratelimit())
|
|
printk(KERN_WARNING
|
|
"audit: audit_backlog=%d > "
|
|
"audit_backlog_limit=%d\n",
|
|
skb_queue_len(&audit_skb_queue),
|
|
audit_backlog_limit);
|
|
audit_log_lost("backlog limit exceeded");
|
|
audit_backlog_wait_time = audit_backlog_wait_overflow;
|
|
wake_up(&audit_backlog_wait);
|
|
return NULL;
|
|
}
|
|
|
|
ab = audit_buffer_alloc(ctx, gfp_mask, type);
|
|
if (!ab) {
|
|
audit_log_lost("out of memory in audit_log_start");
|
|
return NULL;
|
|
}
|
|
|
|
audit_get_stamp(ab->ctx, &t, &serial);
|
|
|
|
audit_log_format(ab, "audit(%lu.%03lu:%u): ",
|
|
t.tv_sec, t.tv_nsec/1000000, serial);
|
|
return ab;
|
|
}
|
|
|
|
/**
|
|
* audit_expand - expand skb in the audit buffer
|
|
* @ab: audit_buffer
|
|
* @extra: space to add at tail of the skb
|
|
*
|
|
* Returns 0 (no space) on failed expansion, or available space if
|
|
* successful.
|
|
*/
|
|
static inline int audit_expand(struct audit_buffer *ab, int extra)
|
|
{
|
|
struct sk_buff *skb = ab->skb;
|
|
int oldtail = skb_tailroom(skb);
|
|
int ret = pskb_expand_head(skb, 0, extra, ab->gfp_mask);
|
|
int newtail = skb_tailroom(skb);
|
|
|
|
if (ret < 0) {
|
|
audit_log_lost("out of memory in audit_expand");
|
|
return 0;
|
|
}
|
|
|
|
skb->truesize += newtail - oldtail;
|
|
return newtail;
|
|
}
|
|
|
|
/*
|
|
* Format an audit message into the audit buffer. If there isn't enough
|
|
* room in the audit buffer, more room will be allocated and vsnprint
|
|
* will be called a second time. Currently, we assume that a printk
|
|
* can't format message larger than 1024 bytes, so we don't either.
|
|
*/
|
|
static void audit_log_vformat(struct audit_buffer *ab, const char *fmt,
|
|
va_list args)
|
|
{
|
|
int len, avail;
|
|
struct sk_buff *skb;
|
|
va_list args2;
|
|
|
|
if (!ab)
|
|
return;
|
|
|
|
BUG_ON(!ab->skb);
|
|
skb = ab->skb;
|
|
avail = skb_tailroom(skb);
|
|
if (avail == 0) {
|
|
avail = audit_expand(ab, AUDIT_BUFSIZ);
|
|
if (!avail)
|
|
goto out;
|
|
}
|
|
va_copy(args2, args);
|
|
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args);
|
|
if (len >= avail) {
|
|
/* The printk buffer is 1024 bytes long, so if we get
|
|
* here and AUDIT_BUFSIZ is at least 1024, then we can
|
|
* log everything that printk could have logged. */
|
|
avail = audit_expand(ab,
|
|
max_t(unsigned, AUDIT_BUFSIZ, 1+len-avail));
|
|
if (!avail)
|
|
goto out_va_end;
|
|
len = vsnprintf(skb_tail_pointer(skb), avail, fmt, args2);
|
|
}
|
|
if (len > 0)
|
|
skb_put(skb, len);
|
|
out_va_end:
|
|
va_end(args2);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
/**
|
|
* audit_log_format - format a message into the audit buffer.
|
|
* @ab: audit_buffer
|
|
* @fmt: format string
|
|
* @...: optional parameters matching @fmt string
|
|
*
|
|
* All the work is done in audit_log_vformat.
|
|
*/
|
|
void audit_log_format(struct audit_buffer *ab, const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
|
|
if (!ab)
|
|
return;
|
|
va_start(args, fmt);
|
|
audit_log_vformat(ab, fmt, args);
|
|
va_end(args);
|
|
}
|
|
|
|
/**
|
|
* audit_log_hex - convert a buffer to hex and append it to the audit skb
|
|
* @ab: the audit_buffer
|
|
* @buf: buffer to convert to hex
|
|
* @len: length of @buf to be converted
|
|
*
|
|
* No return value; failure to expand is silently ignored.
|
|
*
|
|
* This function will take the passed buf and convert it into a string of
|
|
* ascii hex digits. The new string is placed onto the skb.
|
|
*/
|
|
void audit_log_n_hex(struct audit_buffer *ab, const unsigned char *buf,
|
|
size_t len)
|
|
{
|
|
int i, avail, new_len;
|
|
unsigned char *ptr;
|
|
struct sk_buff *skb;
|
|
static const unsigned char *hex = "0123456789ABCDEF";
|
|
|
|
if (!ab)
|
|
return;
|
|
|
|
BUG_ON(!ab->skb);
|
|
skb = ab->skb;
|
|
avail = skb_tailroom(skb);
|
|
new_len = len<<1;
|
|
if (new_len >= avail) {
|
|
/* Round the buffer request up to the next multiple */
|
|
new_len = AUDIT_BUFSIZ*(((new_len-avail)/AUDIT_BUFSIZ) + 1);
|
|
avail = audit_expand(ab, new_len);
|
|
if (!avail)
|
|
return;
|
|
}
|
|
|
|
ptr = skb_tail_pointer(skb);
|
|
for (i=0; i<len; i++) {
|
|
*ptr++ = hex[(buf[i] & 0xF0)>>4]; /* Upper nibble */
|
|
*ptr++ = hex[buf[i] & 0x0F]; /* Lower nibble */
|
|
}
|
|
*ptr = 0;
|
|
skb_put(skb, len << 1); /* new string is twice the old string */
|
|
}
|
|
|
|
/*
|
|
* Format a string of no more than slen characters into the audit buffer,
|
|
* enclosed in quote marks.
|
|
*/
|
|
void audit_log_n_string(struct audit_buffer *ab, const char *string,
|
|
size_t slen)
|
|
{
|
|
int avail, new_len;
|
|
unsigned char *ptr;
|
|
struct sk_buff *skb;
|
|
|
|
if (!ab)
|
|
return;
|
|
|
|
BUG_ON(!ab->skb);
|
|
skb = ab->skb;
|
|
avail = skb_tailroom(skb);
|
|
new_len = slen + 3; /* enclosing quotes + null terminator */
|
|
if (new_len > avail) {
|
|
avail = audit_expand(ab, new_len);
|
|
if (!avail)
|
|
return;
|
|
}
|
|
ptr = skb_tail_pointer(skb);
|
|
*ptr++ = '"';
|
|
memcpy(ptr, string, slen);
|
|
ptr += slen;
|
|
*ptr++ = '"';
|
|
*ptr = 0;
|
|
skb_put(skb, slen + 2); /* don't include null terminator */
|
|
}
|
|
|
|
/**
|
|
* audit_string_contains_control - does a string need to be logged in hex
|
|
* @string: string to be checked
|
|
* @len: max length of the string to check
|
|
*/
|
|
int audit_string_contains_control(const char *string, size_t len)
|
|
{
|
|
const unsigned char *p;
|
|
for (p = string; p < (const unsigned char *)string + len; p++) {
|
|
if (*p == '"' || *p < 0x21 || *p > 0x7e)
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* audit_log_n_untrustedstring - log a string that may contain random characters
|
|
* @ab: audit_buffer
|
|
* @len: length of string (not including trailing null)
|
|
* @string: string to be logged
|
|
*
|
|
* This code will escape a string that is passed to it if the string
|
|
* contains a control character, unprintable character, double quote mark,
|
|
* or a space. Unescaped strings will start and end with a double quote mark.
|
|
* Strings that are escaped are printed in hex (2 digits per char).
|
|
*
|
|
* The caller specifies the number of characters in the string to log, which may
|
|
* or may not be the entire string.
|
|
*/
|
|
void audit_log_n_untrustedstring(struct audit_buffer *ab, const char *string,
|
|
size_t len)
|
|
{
|
|
if (audit_string_contains_control(string, len))
|
|
audit_log_n_hex(ab, string, len);
|
|
else
|
|
audit_log_n_string(ab, string, len);
|
|
}
|
|
|
|
/**
|
|
* audit_log_untrustedstring - log a string that may contain random characters
|
|
* @ab: audit_buffer
|
|
* @string: string to be logged
|
|
*
|
|
* Same as audit_log_n_untrustedstring(), except that strlen is used to
|
|
* determine string length.
|
|
*/
|
|
void audit_log_untrustedstring(struct audit_buffer *ab, const char *string)
|
|
{
|
|
audit_log_n_untrustedstring(ab, string, strlen(string));
|
|
}
|
|
|
|
/* This is a helper-function to print the escaped d_path */
|
|
void audit_log_d_path(struct audit_buffer *ab, const char *prefix,
|
|
const struct path *path)
|
|
{
|
|
char *p, *pathname;
|
|
|
|
if (prefix)
|
|
audit_log_format(ab, "%s", prefix);
|
|
|
|
/* We will allow 11 spaces for ' (deleted)' to be appended */
|
|
pathname = kmalloc(PATH_MAX+11, ab->gfp_mask);
|
|
if (!pathname) {
|
|
audit_log_string(ab, "<no_memory>");
|
|
return;
|
|
}
|
|
p = d_path(path, pathname, PATH_MAX+11);
|
|
if (IS_ERR(p)) { /* Should never happen since we send PATH_MAX */
|
|
/* FIXME: can we save some information here? */
|
|
audit_log_string(ab, "<too_long>");
|
|
} else
|
|
audit_log_untrustedstring(ab, p);
|
|
kfree(pathname);
|
|
}
|
|
|
|
void audit_log_session_info(struct audit_buffer *ab)
|
|
{
|
|
u32 sessionid = audit_get_sessionid(current);
|
|
uid_t auid = from_kuid(&init_user_ns, audit_get_loginuid(current));
|
|
|
|
audit_log_format(ab, " auid=%u ses=%u", auid, sessionid);
|
|
}
|
|
|
|
void audit_log_key(struct audit_buffer *ab, char *key)
|
|
{
|
|
audit_log_format(ab, " key=");
|
|
if (key)
|
|
audit_log_untrustedstring(ab, key);
|
|
else
|
|
audit_log_format(ab, "(null)");
|
|
}
|
|
|
|
void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
|
|
{
|
|
int i;
|
|
|
|
audit_log_format(ab, " %s=", prefix);
|
|
CAP_FOR_EACH_U32(i) {
|
|
audit_log_format(ab, "%08x",
|
|
cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
|
|
}
|
|
}
|
|
|
|
void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
|
|
{
|
|
kernel_cap_t *perm = &name->fcap.permitted;
|
|
kernel_cap_t *inh = &name->fcap.inheritable;
|
|
int log = 0;
|
|
|
|
if (!cap_isclear(*perm)) {
|
|
audit_log_cap(ab, "cap_fp", perm);
|
|
log = 1;
|
|
}
|
|
if (!cap_isclear(*inh)) {
|
|
audit_log_cap(ab, "cap_fi", inh);
|
|
log = 1;
|
|
}
|
|
|
|
if (log)
|
|
audit_log_format(ab, " cap_fe=%d cap_fver=%x",
|
|
name->fcap.fE, name->fcap_ver);
|
|
}
|
|
|
|
static inline int audit_copy_fcaps(struct audit_names *name,
|
|
const struct dentry *dentry)
|
|
{
|
|
struct cpu_vfs_cap_data caps;
|
|
int rc;
|
|
|
|
if (!dentry)
|
|
return 0;
|
|
|
|
rc = get_vfs_caps_from_disk(dentry, &caps);
|
|
if (rc)
|
|
return rc;
|
|
|
|
name->fcap.permitted = caps.permitted;
|
|
name->fcap.inheritable = caps.inheritable;
|
|
name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
|
|
name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >>
|
|
VFS_CAP_REVISION_SHIFT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Copy inode data into an audit_names. */
|
|
void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
|
|
const struct inode *inode)
|
|
{
|
|
name->ino = inode->i_ino;
|
|
name->dev = inode->i_sb->s_dev;
|
|
name->mode = inode->i_mode;
|
|
name->uid = inode->i_uid;
|
|
name->gid = inode->i_gid;
|
|
name->rdev = inode->i_rdev;
|
|
security_inode_getsecid(inode, &name->osid);
|
|
audit_copy_fcaps(name, dentry);
|
|
}
|
|
|
|
/**
|
|
* audit_log_name - produce AUDIT_PATH record from struct audit_names
|
|
* @context: audit_context for the task
|
|
* @n: audit_names structure with reportable details
|
|
* @path: optional path to report instead of audit_names->name
|
|
* @record_num: record number to report when handling a list of names
|
|
* @call_panic: optional pointer to int that will be updated if secid fails
|
|
*/
|
|
void audit_log_name(struct audit_context *context, struct audit_names *n,
|
|
struct path *path, int record_num, int *call_panic)
|
|
{
|
|
struct audit_buffer *ab;
|
|
ab = audit_log_start(context, GFP_KERNEL, AUDIT_PATH);
|
|
if (!ab)
|
|
return;
|
|
|
|
audit_log_format(ab, "item=%d", record_num);
|
|
|
|
if (path)
|
|
audit_log_d_path(ab, " name=", path);
|
|
else if (n->name) {
|
|
switch (n->name_len) {
|
|
case AUDIT_NAME_FULL:
|
|
/* log the full path */
|
|
audit_log_format(ab, " name=");
|
|
audit_log_untrustedstring(ab, n->name->name);
|
|
break;
|
|
case 0:
|
|
/* name was specified as a relative path and the
|
|
* directory component is the cwd */
|
|
audit_log_d_path(ab, " name=", &context->pwd);
|
|
break;
|
|
default:
|
|
/* log the name's directory component */
|
|
audit_log_format(ab, " name=");
|
|
audit_log_n_untrustedstring(ab, n->name->name,
|
|
n->name_len);
|
|
}
|
|
} else
|
|
audit_log_format(ab, " name=(null)");
|
|
|
|
if (n->ino != (unsigned long)-1) {
|
|
audit_log_format(ab, " inode=%lu"
|
|
" dev=%02x:%02x mode=%#ho"
|
|
" ouid=%u ogid=%u rdev=%02x:%02x",
|
|
n->ino,
|
|
MAJOR(n->dev),
|
|
MINOR(n->dev),
|
|
n->mode,
|
|
from_kuid(&init_user_ns, n->uid),
|
|
from_kgid(&init_user_ns, n->gid),
|
|
MAJOR(n->rdev),
|
|
MINOR(n->rdev));
|
|
}
|
|
if (n->osid != 0) {
|
|
char *ctx = NULL;
|
|
u32 len;
|
|
if (security_secid_to_secctx(
|
|
n->osid, &ctx, &len)) {
|
|
audit_log_format(ab, " osid=%u", n->osid);
|
|
if (call_panic)
|
|
*call_panic = 2;
|
|
} else {
|
|
audit_log_format(ab, " obj=%s", ctx);
|
|
security_release_secctx(ctx, len);
|
|
}
|
|
}
|
|
|
|
/* log the audit_names record type */
|
|
audit_log_format(ab, " nametype=");
|
|
switch(n->type) {
|
|
case AUDIT_TYPE_NORMAL:
|
|
audit_log_format(ab, "NORMAL");
|
|
break;
|
|
case AUDIT_TYPE_PARENT:
|
|
audit_log_format(ab, "PARENT");
|
|
break;
|
|
case AUDIT_TYPE_CHILD_DELETE:
|
|
audit_log_format(ab, "DELETE");
|
|
break;
|
|
case AUDIT_TYPE_CHILD_CREATE:
|
|
audit_log_format(ab, "CREATE");
|
|
break;
|
|
default:
|
|
audit_log_format(ab, "UNKNOWN");
|
|
break;
|
|
}
|
|
|
|
audit_log_fcaps(ab, n);
|
|
audit_log_end(ab);
|
|
}
|
|
|
|
int audit_log_task_context(struct audit_buffer *ab)
|
|
{
|
|
char *ctx = NULL;
|
|
unsigned len;
|
|
int error;
|
|
u32 sid;
|
|
|
|
security_task_getsecid(current, &sid);
|
|
if (!sid)
|
|
return 0;
|
|
|
|
error = security_secid_to_secctx(sid, &ctx, &len);
|
|
if (error) {
|
|
if (error != -EINVAL)
|
|
goto error_path;
|
|
return 0;
|
|
}
|
|
|
|
audit_log_format(ab, " subj=%s", ctx);
|
|
security_release_secctx(ctx, len);
|
|
return 0;
|
|
|
|
error_path:
|
|
audit_panic("error in audit_log_task_context");
|
|
return error;
|
|
}
|
|
EXPORT_SYMBOL(audit_log_task_context);
|
|
|
|
void audit_log_task_info(struct audit_buffer *ab, struct task_struct *tsk)
|
|
{
|
|
const struct cred *cred;
|
|
char name[sizeof(tsk->comm)];
|
|
struct mm_struct *mm = tsk->mm;
|
|
char *tty;
|
|
|
|
if (!ab)
|
|
return;
|
|
|
|
/* tsk == current */
|
|
cred = current_cred();
|
|
|
|
spin_lock_irq(&tsk->sighand->siglock);
|
|
if (tsk->signal && tsk->signal->tty && tsk->signal->tty->name)
|
|
tty = tsk->signal->tty->name;
|
|
else
|
|
tty = "(none)";
|
|
spin_unlock_irq(&tsk->sighand->siglock);
|
|
|
|
audit_log_format(ab,
|
|
" ppid=%ld pid=%d auid=%u uid=%u gid=%u"
|
|
" euid=%u suid=%u fsuid=%u"
|
|
" egid=%u sgid=%u fsgid=%u ses=%u tty=%s",
|
|
sys_getppid(),
|
|
tsk->pid,
|
|
from_kuid(&init_user_ns, audit_get_loginuid(tsk)),
|
|
from_kuid(&init_user_ns, cred->uid),
|
|
from_kgid(&init_user_ns, cred->gid),
|
|
from_kuid(&init_user_ns, cred->euid),
|
|
from_kuid(&init_user_ns, cred->suid),
|
|
from_kuid(&init_user_ns, cred->fsuid),
|
|
from_kgid(&init_user_ns, cred->egid),
|
|
from_kgid(&init_user_ns, cred->sgid),
|
|
from_kgid(&init_user_ns, cred->fsgid),
|
|
audit_get_sessionid(tsk), tty);
|
|
|
|
get_task_comm(name, tsk);
|
|
audit_log_format(ab, " comm=");
|
|
audit_log_untrustedstring(ab, name);
|
|
|
|
if (mm) {
|
|
down_read(&mm->mmap_sem);
|
|
if (mm->exe_file)
|
|
audit_log_d_path(ab, " exe=", &mm->exe_file->f_path);
|
|
up_read(&mm->mmap_sem);
|
|
}
|
|
audit_log_task_context(ab);
|
|
}
|
|
EXPORT_SYMBOL(audit_log_task_info);
|
|
|
|
/**
|
|
* audit_log_link_denied - report a link restriction denial
|
|
* @operation: specific link opreation
|
|
* @link: the path that triggered the restriction
|
|
*/
|
|
void audit_log_link_denied(const char *operation, struct path *link)
|
|
{
|
|
struct audit_buffer *ab;
|
|
struct audit_names *name;
|
|
|
|
name = kzalloc(sizeof(*name), GFP_NOFS);
|
|
if (!name)
|
|
return;
|
|
|
|
/* Generate AUDIT_ANOM_LINK with subject, operation, outcome. */
|
|
ab = audit_log_start(current->audit_context, GFP_KERNEL,
|
|
AUDIT_ANOM_LINK);
|
|
if (!ab)
|
|
goto out;
|
|
audit_log_format(ab, "op=%s", operation);
|
|
audit_log_task_info(ab, current);
|
|
audit_log_format(ab, " res=0");
|
|
audit_log_end(ab);
|
|
|
|
/* Generate AUDIT_PATH record with object. */
|
|
name->type = AUDIT_TYPE_NORMAL;
|
|
audit_copy_inode(name, link->dentry, link->dentry->d_inode);
|
|
audit_log_name(current->audit_context, name, link, 0, NULL);
|
|
out:
|
|
kfree(name);
|
|
}
|
|
|
|
/**
|
|
* audit_log_end - end one audit record
|
|
* @ab: the audit_buffer
|
|
*
|
|
* The netlink_* functions cannot be called inside an irq context, so
|
|
* the audit buffer is placed on a queue and a tasklet is scheduled to
|
|
* remove them from the queue outside the irq context. May be called in
|
|
* any context.
|
|
*/
|
|
void audit_log_end(struct audit_buffer *ab)
|
|
{
|
|
if (!ab)
|
|
return;
|
|
if (!audit_rate_check()) {
|
|
audit_log_lost("rate limit exceeded");
|
|
} else {
|
|
struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
|
|
nlh->nlmsg_len = ab->skb->len - NLMSG_HDRLEN;
|
|
|
|
if (audit_pid) {
|
|
skb_queue_tail(&audit_skb_queue, ab->skb);
|
|
wake_up_interruptible(&kauditd_wait);
|
|
} else {
|
|
audit_printk_skb(ab->skb);
|
|
}
|
|
ab->skb = NULL;
|
|
}
|
|
audit_buffer_free(ab);
|
|
}
|
|
|
|
/**
|
|
* audit_log - Log an audit record
|
|
* @ctx: audit context
|
|
* @gfp_mask: type of allocation
|
|
* @type: audit message type
|
|
* @fmt: format string to use
|
|
* @...: variable parameters matching the format string
|
|
*
|
|
* This is a convenience function that calls audit_log_start,
|
|
* audit_log_vformat, and audit_log_end. It may be called
|
|
* in any context.
|
|
*/
|
|
void audit_log(struct audit_context *ctx, gfp_t gfp_mask, int type,
|
|
const char *fmt, ...)
|
|
{
|
|
struct audit_buffer *ab;
|
|
va_list args;
|
|
|
|
ab = audit_log_start(ctx, gfp_mask, type);
|
|
if (ab) {
|
|
va_start(args, fmt);
|
|
audit_log_vformat(ab, fmt, args);
|
|
va_end(args);
|
|
audit_log_end(ab);
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_SECURITY
|
|
/**
|
|
* audit_log_secctx - Converts and logs SELinux context
|
|
* @ab: audit_buffer
|
|
* @secid: security number
|
|
*
|
|
* This is a helper function that calls security_secid_to_secctx to convert
|
|
* secid to secctx and then adds the (converted) SELinux context to the audit
|
|
* log by calling audit_log_format, thus also preventing leak of internal secid
|
|
* to userspace. If secid cannot be converted audit_panic is called.
|
|
*/
|
|
void audit_log_secctx(struct audit_buffer *ab, u32 secid)
|
|
{
|
|
u32 len;
|
|
char *secctx;
|
|
|
|
if (security_secid_to_secctx(secid, &secctx, &len)) {
|
|
audit_panic("Cannot convert secid to context");
|
|
} else {
|
|
audit_log_format(ab, " obj=%s", secctx);
|
|
security_release_secctx(secctx, len);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(audit_log_secctx);
|
|
#endif
|
|
|
|
EXPORT_SYMBOL(audit_log_start);
|
|
EXPORT_SYMBOL(audit_log_end);
|
|
EXPORT_SYMBOL(audit_log_format);
|
|
EXPORT_SYMBOL(audit_log);
|